In some cases, the AC iPurifier will be used with mains wiring that is balanced, e.g after a balanced transformer, or in some countries, where part of the house wiring is balanced (e.g Taiwan). If the mains wiring is balanced, it will not have a polarity. The AC iPurifier will detect it as “undefined polarity” and the LED will turn red. However, this does not mean there is a wiring error in-house.
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